Exhibit 99.51 MBNA MASTER CREDIT CARD TRUST II SERIES 2000-K KEY PERFORMANCE FACTORS March 31, 2001 Expected B Maturity 10/17/2005 Blended Coupon 5.8194% Excess Protection Level 3 Month Average 7.41% March, 2001 7.66% February, 2001 7.42% January, 2001 7.15% Cash Yield20.71% Investor Charge Offs 4.83% Base Rate 8.21% Over 30 Day Delinquency 4.90% Seller's Interest 7.37% Total Payment Rate14.60% Total Principal Balance$56,622,749,044.91 Investor Participation Amount$750,000,000.00 Seller Participation Amount$4,172,058,483.42